Fedora Users — Unable to Create Bootable USB Disk

I know I must be missing something easy. I really hope someone can help me. I have a LexarMedia 128MB USB JumpDrive. I managed previously, through lots of effort which I obviously can't duplicate, to create a bootable drive using mkbootdisk in Mandrake 9.2. Using this, I installed FC1.

I am trying to find and understand a generic way of:

1. Partitioning the USB key
2. Creating the filesystem.
3. Copying the diskboot.img files
4. Booting linux from the usb drive

So far I have tried the following:

sfdisk /dev/sda

   /dev/sda1 : ,,b,*
   /dev/sda2 :
   /dev/sda3 :
   /dev/sda4 :
   y
sfdisk -l /dev/sda

Device Boot Start End #cyls #blocks Id System /dev/sda1 * 0+ 983 984- 125951+ b Win95 FAT32 /dev/sda2 0 - 0 0 0 Empty /dev/sda2 0 - 0 0 0 Empty /dev/sda2 0 - 0 0 0 Empty

dd if=/dev/zero of=/dev/sda1 bs=512 count=1
mkfs.vfat /dev/sda1
mount /iso/FC2/FC2-i386-disk1.iso /mnt/cdrom/ -o loop
mount /mnt/cdrom/images/diskboot.img /mnt/floppy/ -o loop
(at this point usb drive is already mounted at /mnt/removable)
cp /mnt/floppy/* /mnt/removable

Pressed F12 on startup to get boot menu
Selected USB drive
Displayed message is "This disk is not bootable..."

I can open the usb drive in Windows or Linux and read the contents. It all looks OK, but obviously this isn't working. Anyone know why?

Unable to Create Bootable USB Disk - Need Help